CN100502234C - Device and method for digital pulsewidth modulation - Google Patents
Device and method for digital pulsewidth modulation Download PDFInfo
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- CN100502234C CN100502234C CNB2004800028478A CN200480002847A CN100502234C CN 100502234 C CN100502234 C CN 100502234C CN B2004800028478 A CNB2004800028478 A CN B2004800028478A CN 200480002847 A CN200480002847 A CN 200480002847A CN 100502234 C CN100502234 C CN 100502234C
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- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
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- H—ELECTRICITY
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- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/331—Sigma delta modulation being used in an amplifying circuit
Abstract
The invention provides a device for digital pulsewidth modulation, comprising: (a) filter apparatus for filtering the input signal of the filter; (b) quantization apparatus for quantifying the filtering output signal of the filter apparatus; (c) pulse width modulation (PWM) image converter for generating digital PWM signal based on the output signal of the quantization apparatus; and (d) feedback loop for feedbacking the digital PWM signal to the loop input signal and generating the filter input signal by subtraction. The invention also relates to a method of the digital pulsewidth modulation.
Description
Technical field
The present invention relates to the device and method of digital pulsewidth modulation, relate in particular to apparatus and method about the digital pulsewidth modulation of audio ﹠ video signal.
Background technology
Digital pulse width modulator (PWM) is widely used in entertainment electronics appliances and other field.Existing digital pulse width modulator needs higher pulse width time resolution, for example, arrives in the audio range of 20kHz 0, and it needs the clock frequency of about 100MHz.According to Erick Bresch, there is strong relatively nonlinear distortion in " based on the digital audio frequency power amplifier design of the novel feedback strategy of introducing of-TMS320C67 " that Wayne T.Padgett is shown under the system situation to a high-profile in digital pulsewidth modulation.
When using sigma-delta modulation (SDM), only need lower clock frequency for audio signal, for example 2 arrive 4MHz, it is pulse-density-modulation signal that output signal then trends towards, because it is not suitable for for example D class amplification the impulse density of signal correction, so under the unfavorable situation of pulse, this will cause nonlinear distortion.Especially,, be published in " the power numeral is to analog converting ... " in the electronics literature M.B.Sandler1995 April 31, under the sigma-delta modulation case, can not guarantee it is constant pulse frequency according to A.J.McGrath.
Compare with A, class ab ammplifier, the D class A amplifier A has low-down power loss and is generally driven by pulse width modulating signal.As everybody knows, in order to minimize by the caused distortion of time quantization, digital pulse width modulator needs the high time resolution of pulse width modulating signal.Up to the present, digital input signals decreases on amplitude discrimination by means of many (bit) position sigma-delta modulator, for example 8 bits are fit to the dynamic range greater than 80dB, and the quantized signal that has low resolution is then presented to pulse-width modulator.On the one hand, as mentioning, because the high relatively temporal resolution of pulse width signal (8 bits are corresponding to 256 different pulse durations), so need to surpass the high clock frequency of 100MHz, on the other hand, pulse-the width of Chan Shenging-modulation signal can have nonlinear distortion in this way, because it is not pulse width modulating signal but the amplitude quantization signal of feedback in control loop, so these two signals are fully inequality in the base band scope, that is, arrive in the audiorange of 20kHz 0.Therefore, the quantizing noise for pulse width modulating signal is not suppressed best by the control loop in the sigma-delta modulator.
Except its circuit than the complexity, Jorge Varona according to Toronto ECE university shows, " utilize the power supply number-Mo conversion of sigma-delta and pulse width modulation ", known digital pulsewidth modulation method equally also needs higher working clock frequency.In Fig. 6, what describe is a kind of typical structure of digital pulse width modulator.Because pulse width modulating signal 15 ' linearisation, digital input signals 1 is very advantageously to be inserted in the interpolation filter 10, utilizes the noise shaped device 23 in the sigma-delta modulator to limit on amplitude discrimination then.Yet, because the pulse width modulating signal 15 of 23 pairs of quantifications of noise shaped device ' do not process, and before the pulse width modulation of pulse-width modulator 24 quantized amplitudes signal only, so the pulse width modulating signal 15 of actual quantizing noise and time quantization ' can only be suboptimum be suppressed.Digital pulsewidth modulation signal 15 ' filtering in postfilter 16 subsequently usually is preferably in the amplifier installation (not describing) and carries out after the signal amplification.
Summary of the invention
Therefore, the apparatus and method that the purpose of this invention is to provide a kind of digital pulsewidth modulation, under the input signal bandwidth situation bigger, may in amplifier installation, obtain high linearity and low-power consumption by means of these apparatus and method along with the reduction of circuit complexity.
According to the present invention, the method by means of following described digital pulsewidth modulation device and digital pulsewidth modulation of its objective is reaches.
A kind of digital pulsewidth modulation device, comprising:
(a) be used for filter input signal filter filtering device;
(b) be used for the quantization device of the filtering output signal of quantification filtering apparatus;
(c) pulse width modulation imaging transformation apparatus, it is used for producing the digital pulsewidth modulation signal according to the output signal of quantization device; With
(d) feedback control loop, it is used for the digital pulsewidth modulation signal feedback to loop input signal and by subtracting each other the generation filter input signal;
(e) interpolation device, it is used for producing loop input signal from input signal;
The sample rate different with the sample rate of quantization device is provided in filter apparatus.
A kind of device of digital pulsewidth modulation, comprising:
(a) in first feedback control loop, be used for filter input signal filter filtering device;
(b) be used to quantize the quantization device of loop signals;
(c) pulse width modulation imaging transformation apparatus, it is used for producing the digital pulsewidth modulation signal from the output signal of quantization device; With
(d) second feedback control loop, it is used for the digital pulsewidth modulation signal feedback to loop input signal simultaneously by subtracting each other the generation filter input signal,
Can produce loop signals by loop input signal and filter output signal addition;
The sample rate different with the sample rate of quantization device is provided in filter apparatus.
A kind of digital pulsewidth modulation method, this method comprises the following steps:
(a) in filter apparatus, filter input signal is carried out filtering;
(b) filter output signal of quantification filtering apparatus in quantization device;
(c) in pulse width modulation imaging transformation apparatus, from the output signal of quantization device, produce the digital pulsewidth modulation signal; With
(d) in feedback control loop with the digital pulsewidth modulation signal feedback to loop input signal and produce filter input signal;
The sample rate different with the sample rate of quantization device is provided in filter apparatus.
Based on thought of the present invention, be to use pulse width modulating signal to carry out linearisation in fact as the feedback signal in the digital control ring and to it.Therefore, provide the modulator of the improvement sigma-delta (sigma-delta) with multilevel quantization, specify some quantized levels of respective pulses width respectively, they will be as the feedback signal in the control loop then.
In the present invention, especially by providing the device that is fit to digital pulsewidth modulation to solve, this device comprises the problem that begins to mention: (a) be used for filter input signal is carried out the filter filtering device; (b) be used for the quantization device of the filtering output signal of quantification filtering apparatus; (c) pulse width modulation imaging transformation apparatus, it produces the digital pulsewidth modulation signal from the output signal of quantization device; (d) feedback control loop, it is used for the digital pulsewidth modulation signal feedback to loop input signal and by subtracting each other the generation filter input signal.
By this way, even hang down under the situation of temporal resolution at pulse width modulating signal for audio signal, for example under the situation of the 350kHz pulse frequency of eight different pulse durations (3 bit), also can obtain high linearity and so that not have distortion well to being equal to.In addition, guarantee constant pulse frequency, so that under asymmetric pulse situation, do not have linear distortion to take place.For this reason, the present invention is particularly suitable for the generation of the pulse width modulating signal of D class A amplifier A, in addition, because low relatively pulse frequency causes in the amplifier installation or the loss of switch output-stage power in downstream very little.Opposite with prior art, according to the present invention, the digital pulsewidth modulation signal is directly to handle in improved noise shaped device, any insertion that this will cause digital pulsewidth modulation signal higher linearity and not need digital input signals basically.
The favourable development of the corresponding subject content of the present invention and improvement can be found in the claim below.
According to preferred scheme, in filter apparatus, provide the sample rate different with the sample rate of quantization device.
According to preferred scheme further, the pulse frequency of pulse width modulating signal is corresponding to the sample frequency of quantization device and littler by 2 than the sample frequency of filter apparatus
NCoefficient, N is corresponding to the bit number of quantization device.
According to preferred scheme further, pulse width modulation has constant pulse frequency.
According to preferred scheme further, the output signal amplitude of this quantization device can become the pulse duration of pulse width modulating signal in pulse width modulation imaging transformation apparatus.
According to preferred scheme further, two feedback control loops that similarly connect at output each other through overload are provided at least, that is to say in order in load, to produce the pulse width modulating signal of difference, on two loops, provide to be relative to each other and opposite loop input signal.
According to preferred scheme further, amplification and filtering for the digital pulsewidth modulation signal, downstream at pulse width modulation imaging transformation device provides amplifier installation and filter apparatus, amplifier installation with/or filter apparatus be connected to the voltage source that is connected equally with analog-digital converter, the output signal of analog-digital converter is connected to the multiplier in the control loop.
Description of drawings
Exemplary embodiment of the present invention below description and accompanying drawing in will obtain more detailed description, wherein:
Fig. 1 shows the block diagram according to the digital pulsewidth modulation device of first embodiment of the invention;
Fig. 2 is shown as the block diagram of the digital pulsewidth modulation device of explaining second embodiment of the invention;
Fig. 3 is shown as the block diagram of the digital pulsewidth modulation device of explaining third embodiment of the invention;
Fig. 4 is shown as the block diagram of the filter apparatus of explaining embodiment of the invention details;
Fig. 5 is shown as the block diagram of explanation according to the details of Fig. 4;
Fig. 6 shows the block diagram of known digital pulse width modulation device;
Fig. 7 is shown as the block diagram of the digital pulsewidth modulation device of explaining fourth embodiment of the invention;
Fig. 8 is shown as the block diagram of the digital pulsewidth modulation device of explaining fifth embodiment of the invention; With
Fig. 9 is shown as the block diagram of the digital pulsewidth modulation device of explaining sixth embodiment of the invention.
Embodiment
In these figure, identical reference number is represented identical or function components identical part.
What represent among Fig. 1 is the digital pulsewidth modulation device, therein digital input signals 1 processed become digital loop input signal 10 ', preferably in interpolation device 10, interpolation filter for example.Then be summing junction+, filter input signal 10 ＂ present to filter apparatus 11, for example loop filter.Filter apparatus 11 utilize filter sample rate 12 work and output filter output signal 11 ', it is fed to quantization device 13.Improved sigma-delta modulator is made up of filter apparatus 11 and quantization device 13, digital signal 11 ' carry out amplitude quantization in the quantization device 13 of loop filter 11 outputs.Quantization device 13 is according to independently quantised samples rate 14 work.
The output signal 13 of quantization device 13 ' subsequently by pulse width modulation imaging transformation apparatus 15 convert to digital pulsewidth modulation signal 15 ', it is to carry out according to obtaining temporal resolution by the amplitude quantization of quantization device 13.Then, the pulse width modulating signal 15 ' feedback in control loop 17 that produces with a kind of like this method, and summing junction+with loop input signal 10 ' subtract each other, so that generation filter input signal 10 ＂.Post-filtering apparatus 16 better filtering figure pulse width modulating signal 15 ', post-filtering apparatus 16 is preferably arranged in the downstream of amplifier installation (not describing).Because the frequency spectrum of broad is closer to each other, do not insert, so, can select interpolation device 10 only to be suitable for simplifying the postfilter 16 in pulse width modulation downstream according to Fig. 1.
Because the output signal 13 of quantization device 13 ' each amplitude in pulse width modulation imaging transformation apparatus 15, become different pulse durations, so filter apparatus 11 is according to sample rate 12 work different with quantization device 13.The ratio of the sample rate 12 of filter apparatus 11 and the sample rate 14 of quantization device 13 be from pulse width modulating signal 15 ' resolution obtain for example 2
N=sample rate 12/ sample rate 14, N is corresponding to the bit number of quantization device 13 2
NNumber corresponding to possible pulse duration.According to the sample rate 14 of quantization device 13, here obtain pulse width modulating signal 15 ' constant pulse frequency, it is that sample rate 12 with respect to filter apparatus 11 is according to 2
NCoefficient reduce.
Compared to Figure 1 Fig. 2 shows the structure of expansion.Graphic extension is with the digital pulse width modulator of different structure realizations according to Fig. 1 in Fig. 2.The embodiment of the digital pulsewidth modulation that these are different comes down to based on two similar single-ended embodiment among Fig. 1, input signal 1 ,-1, perhaps loop input signal 10 ' ,-10 ', conversion is relative to each other respectively.Two single-ended loops are connected to each other through overload 18 in post-filtering apparatus 16 downstreams.
That describe among Fig. 3 is embodiment according to another digital pulsewidth modulation of the present invention.Digital input signals 1 can be selected to present to interpolation device 10 equally, preferably interpolation filter, and formation loop input signal 10 '.Then summing junction+, loop signals 21 ' and impose on quantization device 13 is provided.The output signal 13 that quantization device 13 quantizes according to sample rate 14 work and transmission ' to pulse width modulation imaging transformation apparatus 15.
According to the digital pulsewidth modulation signal 15 that in pulse width modulation imaging transformation apparatus 15, produces among Fig. 1 ', send to post-filtering apparatus 16 on the one hand, and on the other hand in feedback control loop 22 summing junction+from loop signals 21 ' subtract each other, produce filter input signal 10 ＂, filter input signal 10 ＂ filtering in filter apparatus 19, filter apparatus 19 is according to sample rate 12 work.The filter output signal 11 of filter apparatus 19 ' with loop input signal 10 ' addition be used to produce the loop signals 21 of other loop 21 '.According to Fig. 3, the realization of graphic extension be control loop with " Error Feedback " structure that is similar under the sigma-delta modulator situation, filter apparatus 19 is that this structure adopts.
Fig. 4 shows 4 rank filter apparatus, 11 related application equipment, and filter apparatus has four integrator I1, I2, I3 and I4.According to Fig. 4, filter input signal 10 ＂ multiply by coefficient a0, a1, a2, a3 and through corresponding integrator I1 to I4 and pass through the transmission of additional coefficient α, β and produce filter output signal 11 '.Follow thereafter be quantization device 13 and corresponding quantization output signal 13 '.Provide the quantization resolution of preferable 4 bits, its optimised over-sampling coefficient of 100 that is suitable for according to the loop filter of Fig. 4.For instance, thereby in audiorange, obtain to be suitable for the filter sample rate 12 of 8MHz and 4 bits, this is corresponding to 16 kinds of different pulse durations, according to the single-ended 80dB signal to noise ratio (snr)+THD's of Fig. 1, and according to the pulse width modulating signal 15 of the 93dB SNR+THD under Fig. 2 differential connection situation ' resolution, pulse frequency is 8MHz/2
N=500kHz.
For filter apparatus 11 stablizing under overload situations, can limit by limiter 20 according to the numerical value in Fig. 5 integrator.In addition, resetting can be when pulse width modulation begins, according to the short sequence of 0s control loop 17,17 ', 21,22 input carries out.
That describe in Fig. 7 is another embodiment, its similar embodiment according to Fig. 1.Offer amplifying device 16 operating voltages 25, equally also present to analog-digital converter 26.Digitized then operating voltage 27 also will flow into control loop 17 at phase quadrupler X and digital pulsewidth modulation signal 15 ' multiply each other.
On the other hand, normal D class A amplifier A comes down to the simple switch amplifier, and it does not have operating voltage to suppress and has simple design.Therefore the interference on the operating voltage directly influences output signal and may cause reducing of distortion and weighted signal-to-noise ratio.Yet according to the 4th embodiment, the interference voltage on the operating voltage is digitized.Under the help of this digitlization interference signal 27, in order to compensate, output signal changes and is fed to the form of corresponding conversion the input of pulse-width modulator according to D class output stage 16 then.Because analog-digital converter 26 only digitlization interference voltage, thereby only influence the digital feedback signal 15 of control loop 17 ' pulse amplitude, but do not change feedback signal 15 ' pulse edge, whole dynamic range is not subjected to the restriction of analog-digital converter 26.
Therefore, analog-digital converter 26 can have the resolution more much lower than pulse width modulation modulator.In addition, the stability of digital pulse width modulator is not subjected to the influence of analog-digital converter 26.Output signal distortion or distortion that switching amplifier 16 takes place cause forming interference usually on operating voltage 25.These interference (that is nonideal amplification) are to correct according to the embodiment among Fig. 7.
The effect of amplifier installation 16 can be described as digital pulsewidth modulation signal 15 ' multiply each other with its operating voltage 25.The embodiment of Fig. 7 is based on the simulation of amplifier signal, and wherein the operating voltage 25 of amplifier installation 16 is records digitally, and the amplitude of pulse width modulating signal is and digitlization operating voltage signal 27 is revised in feedback path 17 with multiplying each other.Operating voltage interference or fluctuation is to correct by the feedback in the control loop 17 then.According to Fig. 7, after selecting to insert in interpolation device 10, the digital input signals 1 that amplify is fed to digital pulse width modulator, and this digital pulse width modulator is to make amendment according to the embodiment among Fig. 1.Pulse width modulation imaging transformation device 15 according to the corresponding pulse width modulating signal 15 of pulse width modulating signal 13 ' generation of rudenss quantization '.
The operating voltage 25 of analog-digital converter 26 digital amplifier units 16 and with digital pulsewidth modulation signal 15 ' multiply by it, so its output signal (except that signal level) corresponding to switching amplifier.As a result, digital pulse width modulator is the interference on the writing task voltage 25 also, so suppressed interference by the signal transformation in the control loop 17.Also therefore write down and correspondingly be repaired by the caused self-interference of the switching manipulation of amplifying device 16.Because be selected as significantly less than 1, so that control loop always keeps is stable, because operating voltage 25 does not change (not describing) usually as the voltage drop of crossing over loads in Fig. 7 under identical ratio for the loop gain of self-interference.The resolution of analog-digital converter 26 can be suitable for the dynamic range of operating voltage 25, so that the resolution of pulse width modulating signal is not subjected to the restriction of converter resolution.
The fifth embodiment of the present invention is depicted among Fig. 8, and it is similar to the embodiment according to Fig. 2.Have expansion part among Fig. 7 equally according to the embodiment of Fig. 8, promptly be used for operating voltage 25 is converted into the analog-digital converter unit 26 of digital signal 27, digital signal 27 is passed through phase quadrupler X respectively in two stranded wires 17,17 ' middle coupling.The performance of this differential arrangement with two identical stranded wires is consistent with the embodiment of Fig. 2 basically.Because two amplifying devices 16 suitably provide identical operating voltage, so two signal paths only need an analog-digital converter 16 (not describing) in Fig. 8.
Has diverse design according to the digital pulse width modulator of Fig. 8 and follow-up D class multiplication factor, even the system dynamics scope of utilizing the thick quantification of operating voltage signal 25 also can be kept perfectly fully doubles because disturb.Therefore, the quantizing noise of A-D converter 26 is not exaggerated yet, and for example, has in input under the situation of zero-signal.For the accurate simulation of pulse width modulation output amplitude, promptly accurate as far as possible in order to obtain the amplitude simulation at control loop, the necessary ratio of determining working voltage source 25 internal resistances and amplifier 16 internal resistances.
What describe among Fig. 9 is the sixth embodiment of the present invention, and it is based on Fig. 3 embodiment.Here, revise the generation that also comprises digitized signal 27, it produces in analog-digital converter 26 according to the operating voltage that appears at amplifier installation 16.This digitlization operating voltage signal 27 in control loop 22 with digitlization pulse width modulating signal 15 ' combine with multiplying each other.Utilization is according to " Error Feedback " structure of Fig. 9, and loop filter 19 has the transfer function of modification, as described according to Fig. 3.
Though described the present invention according to several exemplary embodiments as mentioned above, it is not limited to these but can makes amendment in many ways.
For example, because under the situation that the pulse of pulse width modulating signal dynamically is out of shape than hanging down quantity of pulse duration, can corrected value be incorporated into control loop by means of check table, even thereby exist under the situation of the distortion of depending on the pulse duration in the amplifier installation (not shown) fully, also can obtain the linear spectral of digital pulse width modulator.Except that these, the filter apparatus on 4 rank, perhaps 4 and 3 of filter apparatus and quantization device bits are considered to respectively that mode by example provides.According to the present invention, also can easily realize being with and promote blood circulation towards width modulated.
List Names
1 input signal
10 interpolation devices, for example interpolation filter
10 ' loop input signal
10 " filter input signals
11 filter apparatus, especially loop filter
11 ' filter output signal
12 filter sample rates
13 quantization devices
The output signal of 13 ' quantization device
The sample rate of 14 quantization devices
15 pulse width modulation imaging transformation devices
15 ' digital pulsewidth modulation signal
16 amplifier installations and filter apparatus, the especially postfilter in amplifier downstream
17 control loops
17 ' parallel similar control loop
18 loads
19 filter apparatus (Error Feedback structure)
The restraint device of 20 integrators
21 control loops
20 ' loop signals
20 control loops
23 noise reshapers (sigma-delta modulator)
24 pulse width modulations (PWM)
25 operating voltages
26 analog-digital converters
27 digitized operating voltage signals
I, the I1-I4 integrator
a
0-a
4Coefficient
The α beta coefficient
+ summing junction
-subtract each other
Claims (14)
1. digital pulsewidth modulation device, comprising:
(a) be used for filter input signal (10 ＂) filter filtering device (11);
(b) be used for the quantization device (13) of the filtering output signal (11 ') of quantification filtering apparatus (11);
(c) pulse width modulation imaging transformation apparatus (15), it is used for producing digital pulsewidth modulation signal (15 ') according to the output signal of quantization device (13) (13 ');
(d) feedback control loop (17), it is used for digital pulsewidth modulation signal (15 ') is fed back to loop input signal (10 ') and produces filter input signal (10 ＂) by subtracting each other; And
(e) interpolation device (10), it is used for producing loop input signal (10 ') from input signal (1);
The sample rate (12) different with the sample rate (14) of quantization device (13) is provided in filter apparatus (11).
2. digital pulsewidth modulation device according to claim 1 is characterized in that described interpolation device (10) is an interpolation filter.
3. digital pulsewidth modulation device according to claim 1, it is characterized in that also being provided with post-filtering apparatus (16) and be used for filtering pulse width modulating signal (15 '), wherein post-filtering apparatus (16) is arranged on the downstream of pulse width modulation imaging transformation apparatus (15), and be connected with the voltage source that is connected to analog-digital converter (26) equally (25), the output signal (27) of analog-digital converter (26) is connected to the multiplier in the control loop and is multiplied each other by digital pulsewidth modulation signal (15 ').
4. digital pulsewidth modulation device according to claim 1, it is characterized in that the sample frequency (14) of the pulse frequency of described pulse width modulating signal (15 ') corresponding to quantization device (13), and than the coefficient of the little 2N of sample frequency (12) of filter apparatus (11), N is corresponding to the bit number of quantization device (13).
5. digital pulsewidth modulation device according to claim 1 is characterized in that described pulse width modulating signal (15 ') has constant pulse frequency.
6. digital pulsewidth modulation device according to claim 1 is characterized in that the amplitude of the output signal (13 ') of quantization device (13) can be transformed into the pulse duration of described pulse width modulating signal (15 ') in described pulse width modulation imaging transformation apparatus (15).
7. digital pulsewidth modulation device according to claim 1, it is characterized in that providing two feedback control loops (17,17 ', 11,13,15) to be connected to each other at output, on two loops, provide reciprocal loop input signal (10 ' ,-10 ') to be used for going up the pulse width modulating signal that produces difference in load (18) through overload (18).
8. digital pulsewidth modulation device according to claim 1, the 4 rank loop filters that it is characterized in that providing the quantization device (13) with 4 bit resolutions are as filter apparatus (11).
9. digital pulsewidth modulation device according to claim 1 is characterized in that providing restraint device (20) to be used to limit the output valve of integrator (I) in filter apparatus (11) for stablizing under the overload situations.
10. digital pulsewidth modulation device, comprising:
(a) in first feedback control loop (21), be used for filter input signal (10 ＂) filter filtering device (19);
(b) be used to quantize the quantization device (13) of loop signals (21 ');
(c) pulse width modulation imaging transformation apparatus (15), it is used for producing digital pulsewidth modulation signal (15 ') from the output signal of quantization device (13) (13 '); With
(d) second feedback control loop (22), it is used for that digital pulsewidth modulation signal (15 ') is fed back to loop input signal (21 ') and produces filter input signal (10 ＂) by subtracting each other simultaneously,
Can pass through loop input signal (10 ') and filter output signal (11 ') addition and produce loop signals (21 ');
The sample rate (12) different with the sample rate (14) of quantization device (13) wherein is provided in filter apparatus (19).
11. digital pulsewidth modulation device according to claim 10, it is characterized in that being provided with amplifier installation and filter apparatus (16) in pulse width modulation imaging transformation device downstream, be used for the amplification and the filtering of digital pulsewidth modulation signal (15 '), and amplifier installation with/or filter apparatus (16) be connected to the voltage source (25) that is connected equally with analog-digital converter (26), the output signal (27) of analog-digital converter (26) is connected to the multiplier in the control loop and is multiplied each other by digital pulsewidth modulation signal (15 ').
12. the digital pulsewidth modulation method, this method comprises the following steps:
(a) in filter apparatus (11), filter input signal (10 ＂) is carried out filtering;
(b) filter output signal (11 ') of quantification filtering apparatus (11) in quantization device (13);
(c) in pulse width modulation imaging transformation apparatus (15), from the output signal (13 ') of quantization device (13), produce digital pulsewidth modulation signal (15 '); With
(d) in feedback control loop (17), digital pulsewidth modulation signal (15 ') fed back to loop input signal (10 ') and produce filter input signal (10 ＂);
The sample rate (12) different with the sample rate (14) of quantization device (13) wherein is provided in filter apparatus (11).
13. digital pulsewidth modulation method according to claim 12 is characterized in that described step (a)-(d) is used for carrying out band and promotes blood circulation towards width modulated.
14. digital pulsewidth modulation method according to claim 12, it is characterized in that afterwards in step (c), by amplification and the filtering that amplifier installation and filter apparatus (16) are used for digital pulsewidth modulation signal (15 ') is set in pulse width modulation imaging transformation device (15) downstream, and amplifier installation with/or filter apparatus (16) be connected to the voltage source (25) that is connected equally with analog-digital converter (26), the output signal (27) of analog-digital converter (26) is connected to control loop (17; 22) multiplier in and multiplied each other by digital pulsewidth modulation signal (15 '), operating voltage signal (25) are digitized and are coupled to control loop (17,17 ', 22) in analog-digital converter (26).
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| DE102006006083B4 (en) | 2006-02-09 | 2014-09-04 | Infineon Technologies Ag | Apparatus and method for pulse width modulation |
| US8410963B2 (en) * | 2011-03-23 | 2013-04-02 | Infineon Technologies Ag | Data converter circuit and method |
| US9748835B2 (en) | 2014-11-17 | 2017-08-29 | Infineon Technologies Austria Ag | Digital power factor correction |
| DE102017117364B4 (en) * | 2017-08-01 | 2024-01-25 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Method and device for operating a mechatronic system with a converter |
| US10177776B1 (en) * | 2017-08-04 | 2019-01-08 | Mitsubishi Electric Research Laboratories, Inc. | Noise mitigating quantizer for reducing nonlinear distortion in digital signal transmission |
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| US6373334B1 (en) * | 2000-06-12 | 2002-04-16 | Cirrus Logic, Inc. | Real time correction of a digital PWM amplifier |
| GB0110340D0 (en) * | 2001-04-27 | 2001-06-20 | Watts Robert D | A signal processing circuit |
| US7200187B2 (en) * | 2001-07-26 | 2007-04-03 | O'brien Thomas J | Modulator for digital amplifier |
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| CN106664065A (en) * | 2014-09-08 | 2017-05-10 | 高通国际科技有限公司 | Pulse-width modulation generator |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10327620A1 (en) | 2004-08-19 |
| DE10327620B4 (en) | 2014-09-11 |
| CN1742429A (en) | 2006-03-01 |
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